A shield tunnel underpasses underground structure group curtain blocking effect detection method, system, terminal and storage medium

Abstract

The application belongs to the technical field of shield tunnel construction, and discloses a method, system, terminal and storage medium for detecting the curtain blocking effect of a shield tunnel underpassing an underground structure group, which comprises the following steps: acquiring first construction parameters of a shield tunnel and structure parameters of the underground structure; constructing a numerical model of a target plot based on the first construction parameters and the structure parameters; determining the type of a constitutive model according to the material parameters of the target plot, simulating the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model; acquiring the cross-sectional images of each underground structure at a preset construction time, calculating the ellipticity of the cross section in each cross-sectional image, and judging whether there is a curtain blocking effect between all the underground structures according to the ellipticity; and calculating and outputting the curtain blocking effect coefficient between the underground structures with the curtain blocking effect according to the ellipticity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield tunnel construction, in particular to a shield tunnel underpassing underground structure group curtain blocking effect detection method, system, terminal and storage medium. BACKGROUND

[0002] The mainstream trend of the current underground transportation network is to develop vertically and deeply, from the traditional single subway line to the multi-mode coordinated development. As an efficient and safe underground space development method, the super-large diameter shield tunnel is widely used in infrastructure construction such as subway, highway and railway.

[0003] In the city dense area, the newly built tunnel often needs to underpass the existing underground structure group, but the close-range construction of the newly built tunnel will disturb the surrounding soil and cause the deformation of the existing structure, which threatens the safe operation of the existing structure. The existing technology uses the curtain effect to represent the shielding effect of a single existing structure on soil deformation, but it is not applicable to the scene of the newly built tunnel underpassing the existing underground structure group. Therefore, the curtain blocking effect is introduced on the basis of the curtain effect, which is used to represent the interaction between the existing underground structures or the structure and the soil when the newly built tunnel underpasses the existing underground structure group. This interaction makes the soil deformation and stress redistribution caused by the construction of the newly built tunnel be "blocked" or "shielded" to a certain extent, thereby weakening the direct impact on a particular structure.

[0004] The existing technology focuses on studying the influence law of the deformation of a single existing tunnel in the underground structure group, and does not involve studying the curtain blocking effect between multiple existing tunnels in the newly built tunnel underpassing the existing underground structure group. Therefore, the existing technology needs to be improved. SUMMARY

[0005] The technical problem to be solved by the present application is that, in view of the defects of the prior art, the present application provides a shield tunnel underpassing underground structure group curtain blocking effect detection method, system, terminal and storage medium to solve the technical blank problem of the existing shield tunnel underpassing underground structure group curtain blocking effect research.

[0006] The technical solution adopted by the present application to solve the technical problem is as follows:

[0007] In a first aspect, the present application provides a shield tunnel underpassing underground structure group curtain blocking effect detection method, the underground structure group comprising at least two underground structures, the shield tunnel underpassing underground structure group curtain blocking effect detection method comprising:

[0008] obtaining the first construction parameter of the shield tunnel and the structure parameter of the underground structure;

[0009] construct a numerical model of the target plot based on the first construction parameter and the structure parameter, wherein the target plot is a target plot of shield tunnel construction;

[0010] determine a constitutive model type according to a material parameter of the target plot, and simulate a construction process of the shield tunnel in the numerical model based on the first construction parameter and the constitutive model type;

[0011] obtain a cross-sectional image of each of the underground structures at a preset construction time, calculate an ellipticity of a cross section in each of the cross-sectional images, and determine whether there is a curtain blocking effect between all of the underground structures according to the ellipticity;

[0012] calculate and output a curtain blocking effect coefficient between the underground structures with the curtain blocking effect according to the ellipticity.

[0013] In an implementation manner, the constructing the numerical model of the target plot based on the first construction parameter and the structure parameter comprises:

[0014] determining a boundary parameter of the target plot based on the first construction parameter, and establishing a first model of the target plot according to the boundary parameter;

[0015] determining a second construction parameter and a position parameter of the underground structure based on the structure parameter;

[0016] adding the underground structure into the first model according to the second construction parameter and the position parameter to obtain the numerical model of the target plot.

[0017] In an implementation manner, the determining the constitutive model type according to the material parameter of the target plot, and simulating the construction process of the shield tunnel based on the first construction parameter and the constitutive model type comprises:

[0018] obtaining a material parameter of the target plot;

[0019] determining a constitutive model type used in the simulation construction process of the shield tunnel according to the material parameter;

[0020] balancing the earth stress of the target plot, and activating all of the underground structures in the target plot;

[0021] dividing the simulation construction process of the shield tunnel into a preset number of construction sections, simulating a shield tunnel construction process of each of the construction sections on the numerical model using the constitutive model, and completing a construction simulation of all of the underground structures in the target plot.

[0022] In an implementation, the determining the constitutive model type according to the material parameters of the target block, and simulating the construction process of the shield tunnel based on the constitutive model and the first construction parameter further comprises: sequentially selecting a single underground structure in the shield tunnel which has not been simulated in the secondary construction simulation for secondary construction simulation until all the underground structures complete the secondary construction simulation.

[0023] The method for the secondary construction simulation comprises:

[0024] reloading the numerical model which has not simulated the construction process of the shield tunnel;

[0025] closing all the underground structures in the target block and activating a single underground structure in the target block;

[0026] re-equilibrating the ground stress of the target block, and simulating the construction process of the shield tunnel in each construction section on the numerical model using the constitutive model.

[0027] In an implementation, the obtaining the cross-sectional image of each underground structure at a preset construction time, and calculating the ellipticity of the cross-section in each cross-sectional image comprises:

[0028] obtaining the cross-sectional image of each underground structure at a preset construction time;

[0029] drawing a cross-sectional relative deformation map based on the cross-sectional image and the structure parameters of the underground structure;

[0030] calculating the ellipticity of the cross-section in each cross-sectional image according to the cross-sectional relative deformation map.

[0031] In an implementation, the determining whether there is a curtain blocking effect between all the underground structures according to the ellipticity comprises:

[0032] selecting a first underground structure which needs to perform the determination of the existence of the curtain blocking effect from all the underground structures according to a preset rule;

[0033] sequentially obtaining the ellipticity of the cross-section of the first underground structure at all preset construction times in the primary construction simulation and the secondary construction simulation;

[0034] if the ellipticity of the first underground structure at any construction time in the primary construction simulation is greater than the ellipticity of the first underground structure at the same construction time in the secondary construction simulation, the first underground structure is determined to be an underground structure with the curtain blocking effect;

[0035] obtaining a second underground structure corresponding to the first underground structure based on structural parameters of the underground structure, and determining that there is a curtain blocking effect between the first underground structure and the second underground structure if the second underground structure is an underground structure with a curtain blocking effect.

[0036] In an implementation manner, the calculating and outputting of the curtain blocking effect coefficient between the underground structures with the curtain blocking effect according to the ellipticity includes:

[0037] selecting a third underground structure, and the third underground structure and a fourth underground structure have a curtain blocking effect;

[0038] obtaining a first ellipticity, the first ellipticity being defined as an average of minimum values of ellipticities of the third underground structure and the fourth underground structure at a preset construction time when all the underground structures in the target plot are activated;

[0039] obtaining a second ellipticity, the second ellipticity being defined as a minimum value of an ellipticity of the third underground structure at a preset construction time when only the third underground structure in the target plot is activated;

[0040] calculating and outputting a curtain blocking effect coefficient according to the first ellipticity and the second ellipticity:

[0041] ;

[0042] wherein, the curtain blocking effect coefficient, the first ellipticity, the second ellipticity.

[0043] In a second aspect, the present application provides a shield tunnel curtain blocking effect detection system for passing through an underground structure group, comprising:

[0044] a parameter acquisition module, configured to acquire first construction parameters of a shield tunnel and structural parameters of the underground structure;

[0045] a model establishment module, configured to construct a numerical model of a target plot based on the first construction parameters and the structural parameters; wherein the target plot is a target plot of shield tunnel construction;

[0046] a construction simulation module, configured to determine a constitutive model type according to material parameters of the target plot, and simulate a construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model;

[0047] The curtain blocking effect judgment module is configured to acquire cross-sectional images of each underground structure at a preset construction time, calculate an ellipticity of a cross section in each cross-sectional image, and determine whether there is a curtain blocking effect between all the underground structures according to the ellipticity.

[0048] The curtain blocking effect calculation module is configured to calculate and output a curtain blocking effect coefficient between underground structures with the curtain blocking effect according to the ellipticity.

[0049] In a third aspect, the present application provides a terminal, comprising a processor and a memory, wherein the memory stores a shield tunnel underpassing underground structure group curtain blocking effect detection program, and the shield tunnel underpassing underground structure group curtain blocking effect detection program is used to implement the operations of the shield tunnel underpassing underground structure group curtain blocking effect detection method according to the first aspect when executed by the processor.

[0050] In a fourth aspect, the present application further provides a computer readable storage medium, wherein the computer readable storage medium stores a shield tunnel underpassing underground structure group curtain blocking effect detection program, and the shield tunnel underpassing underground structure group curtain blocking effect detection program is used to implement the operations of the shield tunnel underpassing underground structure group curtain blocking effect detection method according to the first aspect when executed by a processor.

[0051] The technical scheme of the present application has the following effects:

[0052] The present application establishes a numerical model of a target plot based on the first construction parameter of a shield tunnel, acquires cross sections of an existing underground structure group at a preset construction time by simulating the construction process of the shield tunnel, and can further determine whether there is a curtain blocking effect between the existing underground structures, and a calculation method for calculating the curtain blocking effect between multiple existing tunnels through ellipticity is given. The curtain blocking effect can reflect the interaction between the existing underground structures or between the structures and the soil, is suitable for construction scheme analysis of the complex underground structure group interaction engineering scene, and further proposes a curtain blocking effect coefficient to quantify the strength of the curtain blocking effect, thereby providing data support for guiding actual engineering construction. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in the drawings without creative labor.

[0054] Figure 1It is a flow chart of the shielding and blocking effect detection method of the shield tunnel underpassing the underground structure group in the application.

[0055] Figure 2 It is a line cross section view of the shield tunnel in the application.

[0056] Figure 3 It is a relative position relation profile of the shield tunnel and the first subway line and the high-speed rail line in the application.

[0057] Figure 4 It is a numerical model schematic diagram of the target land plot in the application.

[0058] Figure 5 It is a shield tunneling simulation schematic diagram of the new line shield tunnel in the application.

[0059] Figure 6 It is a simulation construction schematic diagram of the shield tunnel underpassing the first subway line tunnel and the high-speed rail line tunnel in the numerical model in the application.

[0060] Figure 7 It is a survey line and characteristic point schematic diagram of the shield tunnel simulation construction in the application.

[0061] Figure 8 It is a relative deformation view of the cross section of the right line tunnel of the subway in the application.

[0062] Figure 9 It is a relative deformation view of the cross section of the left line tunnel of the subway in the application.

[0063] Figure 10 It is an ellipticity calculation parameter identification schematic diagram in the application.

[0064] Figure 11 It is a cross section ellipticity change curve diagram of the first subway line tunnel in the application.

[0065] Figure 12 It is a functional principle diagram of the terminal in one implementation manner of the application.

[0066] The purpose implementation, functional features and advantages of the application will be further described with reference to the drawings in combination with the embodiments. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical scheme and advantages of the application more clear and definite, the application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.

[0068] Exemplary method

[0069] When developing underground space by using shield tunnel, the new tunnel will inevitably need to pass through the existing underground structure group, but this type of close-range construction will disturb the surrounding soil and cause deformation of the existing structure, threatening the safe operation of the existing structure. At the same time, the high settlement requirement of part of the existing structure, the deformation of the actual structure, threatens the safe operation of the existing structure; the complex stratum conditions of the actual construction also bring great challenges to the crossing project.

[0070] The diameter of the super-large diameter shield tunnel is 2-3 times that of the conventional tunnel, which causes greater disturbance to the stratum and the existing structure, and the mechanism of action between the existing underground structure group is complex, so the research on the scenario of the super-large diameter shield tunnel passing through the existing underground structure group is more important. When facing this scenario, the existing technology mostly uses numerical analysis method, studies the influence law of single tunnel deformation for two factors of vertical clearance between new and old tunnels and reinforcement of existing structure, and for the scenario of new tunnel passing through the existing underground structure group, it also focuses on studying the influence law of single tunnel deformation in the underground structure group, such as the study of shadowing effect, which is defined as: the new tunnel has a certain "shielding" effect on the deformation of the soil above during the construction process, which causes the soil settlement within a certain range above the existing tunnel to be less than the theoretical settlement without the tunnel. The reason for causing the shadowing effect is that the stiffness of the existing tunnel is much greater than that of the surrounding soil; the shadowing effect decreases as the distance between the new and old tunnels increases. However, the existing technology does not study the change law of the tunnel section during the shield construction process, and does not consider the shadowing blocking effect between multiple existing underground structures in the existing underground structure group.

[0071] In view of the above technical problems, a shield tunnel passing through underground structure group shadowing blocking effect detection method is provided in the embodiment of the present application, the underground structure group includes at least two underground structures, the shield tunnel passing through underground structure group shadowing blocking effect detection method includes: obtaining the first construction parameter of the shield tunnel and the structure parameter of the underground structure; based on the first construction parameter and the structure parameter, a numerical model of a target plot is constructed; wherein the target plot is a target plot of shield tunnel construction; determining the constitutive model type according to the material parameter of the target plot, simulating the construction process of the shield tunnel in the numerical model based on the first construction parameter and the constitutive model; obtaining the cross-sectional image of each underground structure at a preset construction time, calculating the ellipticity of the cross section in each cross-sectional image, and determining whether there is a shadowing blocking effect between all the underground structures according to the ellipticity; according to the ellipticity, the shadowing blocking effect coefficient between the underground structures with shadowing blocking effect is calculated and output.

[0072] As Figure 1As shown, the embodiment of the present application provides a curtain barrier effect detection method for shield tunnel underpassing underground structure group, comprising the following steps:

[0073] In step S100, the first construction parameter of the shield tunnel and the structure parameter of the underground structure are acquired.

[0074] It should be noted that the underground structure group includes at least two underground structures, that is, the premise of the curtain barrier effect is that the target land mass of the shield tunnel construction has an underground structure group including at least two underground structures. When the underground structures of the existing underground structure group have the curtain barrier effect, the interaction between the underground structures will reduce the influence effect caused by the shield tunnel underpassing.

[0075] Among them, the curtain barrier effect refers to the interaction between the existing underground structures or the structures and the soil when the new tunnel underpasses the existing underground structure group (such as multiple tunnels, underground continuous walls, pile foundations, etc.), which makes the soil deformation and stress redistribution caused by the new tunnel construction be "blocked" or "shielded" to a certain extent, thereby weakening the direct influence on a specific structure. The effect is specifically manifested as follows: the existing underground structure group has mutual influence, so that the decrease in the ellipticity of the cross section caused by the new tunnel underpassing is reduced, and by comparing the single line and double line coexistence of the existing underground structure, it is found that the ellipticity change is smaller when the double lines coexist, which indicates that there is mutual "curtain" effect between the existing underground structures, and further, the curtain barrier effect coefficient to quantify the strength of the curtain barrier effect. The curtain barrier effect is an extension and development of the curtain effect on the "structure group" scale, and is more suitable for the interaction of complex underground structure group.

[0076] In this embodiment, the planning of a new line in a city is described. After the first section of the new line underpasses the existing tunnel, the shield form is used to underpass the existing first subway line, high-speed rail line, second section, industrial park and airport, and the shield is ended in the third section, crosses the second subway line after underpassing the fourth section, and stops in the fifth section. The total length of the line is about 3.9 km, and the total length of the closed section is 3127 m.

[0077] Among them, the minimum clear distance between the new line and the existing tunnel is 0.5 m, the minimum clear distance between the new line and the first subway line is 6.6 m, the minimum clear distance between the new line and the high-speed rail line is 27.7 m, the minimum clear distance between the new line and the second section is 35.4 m, the minimum clear distance between the new line and the industrial park is 32.9 m, the minimum clear distance between the new line and the airport runway is 34 m, the minimum clear distance between the new line and the third section is 5.6 m, and the minimum clear distance between the new line and the second subway line is 5.3 m.

[0078] In the embodiment, the first construction parameter of the shield tunnel is obtained, that is, the construction parameter of the new line in the form of shield underpassing the existing subway line, high-speed rail line, industrial park and airport, and ending the shield process in the second road section.

[0079] As shown in Figure 2 , a line cross section diagram of the shield tunnel, unit: mm. The shield tunnel construction mode of the new line is double-pipe shield, obtaining a bidirectional shield tunnel with a total of 6 lanes, wherein the outer diameter of the unilateral shield section is 14.5 m, the segment thickness is 0.6 m, the internal unilateral is 3 lanes, the road width form of the carriageway arrangement is 3.5 m+3.5 m+3.5 m, the passing net height is 4.5 m, the net distance of the left line of the shield tunnel and the right line of the shield tunnel is 14.5 m, the shield tunnel is buried at a depth of 35.01 m, and the shield lower space can be arranged according to the actual pipeline demand.

[0080] The first construction parameter of the shield tunnel is the diameter of the shield tunnel, the net distance between the shield tunnel and the existing underground structure, and the net distance between the left line of the shield tunnel and the right line of the shield tunnel, that is, the outer diameter length of the unilateral shield section. The construction parameters in a broad sense also include segment thickness, road width form, passing net height, etc., but these parameters will not affect the research on the curtain blocking effect and can be ignored.

[0081] In the embodiment, the existing underground structure underpassing by the shield tunnel mainly includes the first subway line and the high-speed rail line, and the structural parameters of the underground structure are obtained, that is, the structural parameters of the first subway line and the high-speed rail line are obtained.

[0082] The first subway line is a northeast-southwest city area express line connecting the central urban area, the airport and the remote municipal area, the vehicle thereof adopts 6A marshalling, and the design speed is 100 km / h. As shown in Figure 3 , a relative position relationship section view of the shield tunnel and the first subway line and the high-speed rail line, the horizontal intersection area of the first subway line and the shield tunnel is shield construction, the shield segment size is an outer diameter of 6 m, the segment thickness is 0.3 m, the intersection area plane is a straight line, and the relative position of the underpassing node is shown in Figure 3 , the shield tunnel underpasses the existing first subway line in the range of K1+243.36 to K1+281.951, the buried depth of the first subway line at the underpassing position is 22.5 m, the first subway line is double line, the net distance between the left line of the subway and the right line of the subway is 8.6 m, the vertical net distance with the shield tunnel is 6.6 m, and the horizontal net distance of the left line of the subway from the high-speed rail tunnel is 36.7 m.

[0083] The high-speed rail line under the shield tunnel is near DK179+370 mileage, located in the interval of airport station-airport west station, about 2901 m away from the airport station. The high-speed rail line is a single-hole double-line tunnel in DK179+941 to DK179+370 range interval, constructed by open excavation method, ballastless track, and the tunnel is buried 5.66 m to 10.56 m deep. The tunnel of the high-speed rail line is buried 5.7 m deep at DK179+370 mileage under the shield tunnel. The open excavation support form is a Ø1.2 m@2.4 m bored pile + internal support form. The widest part of the tunnel of the high-speed rail line is 13.4 m, the height difference between the top and the bottom is 10.84 m, the lateral clearance with the first subway tunnel is 36.7 m, and the lining thickness is 0.5 m. The shield tunnel underpasses the tunnel of the high-speed rail line. The shield tunnel is buried 35.1 m deep at the node, the closest distance between the top of the shield tunnel structure and the bottom plate of the tunnel of the high-speed rail line structure is 18.5 m, the distance from the bottom of the support pile is about 14.5 m, and the main structure of the shield tunnel is located in the moderately weathered mudstone.

[0084] In the embodiment, when the shield tunnel underpasses the existing high-speed rail tunnel, the existing high-speed rail tunnel is a single-hole double-line tunnel, and there is no parallel tunnel line. Therefore, the shield tunnel does not produce the curtain blocking effect when underpassing the existing high-speed rail tunnel. The high-speed rail tunnel is introduced to make the established model closer to the actual situation. Similarly, the planning of the new line is described, including the second section under the shield, the industrial park, the airport, etc. The embodiment only uses this part of the content to assist in determining the actual position of the shield tunnel underpass. The first subway line is double-line, which may have a curtain blocking effect. Therefore, the first subway line is the focus of the embodiment.

[0085] In the embodiment, the first construction parameter of the shield tunnel and the structure parameter of each underground structure are obtained, which facilitates preliminary understanding of the existing underground structure in the target land block of the shield tunnel construction of the new line, and can preliminarily screen the existing underground structure that may have a curtain blocking effect.

[0086] As shown in Figure 1 , the embodiment of the present application provides a shield tunnel underpassing underground structure group curtain blocking effect detection method, comprising the following steps:

[0087] Step S200, based on the first construction parameter and the structure parameter, a numerical model of the target land block is constructed; wherein the target land block is a target land block of shield tunnel construction.

[0088] Specifically, in one implementation manner of the embodiment, step S200 comprises the following steps:

[0089] Step S201: Determine the boundary parameters of the target plot based on the first construction parameters, and establish a first model of the target plot based on the boundary parameters.

[0090] In this embodiment, the first model is mainly used to simulate the part of the shield tunnel passing under the first subway line and high-speed rail line. This part is taken as the target site for the shield tunnel construction in this embodiment. The first model of the track and shield system is established by using three-dimensional geotechnical engineering finite element analysis software. In this embodiment, the first model corresponding to the target site is a three-dimensional finite element model.

[0091] As an example, the 3D geotechnical engineering finite element analysis software used in this embodiment is Plaxis 3D, which focuses on 3D simulation of geotechnical engineering and supports simulation of complex geological conditions and construction processes. Other 3D geotechnical engineering finite element analysis software that can be used include MIDAS GTS NX or FLAC3D.

[0092] Specifically, before establishing the first model, the boundary parameters of the target plot need to be determined based on the first construction parameters to eliminate the influence of boundary effects. In the area where the shield tunnel and the first subway line tunnel and high-speed rail line tunnel intersect horizontally, a distance greater than 3.5D needs to be reserved on all four sides, and a distance greater than 2D needs to be reserved at the bottom. The top is the ground. The net distance between the shield tunnel and the existing underground structure and the top can be determined based on the actual burial depth. D is the diameter of the shield tunnel.

[0093] In this embodiment, the diameter D of the shield tunnel is 14.5m. Therefore, the corresponding boundary parameters need to reserve a distance of at least 50.75m in all directions and at least 29m at the bottom. Considering that the shield tunnel is a twin-tube shield, with one shield tunnel on each side, and the net distance between the left and right shield tunnel lines is 14.5m, and the maximum horizontal net distance from the leftmost point of the left shield tunnel line to the rightmost point of the right shield tunnel line is 43.5m, the width of the boundary parameters must be at least greater than 145m. The length of the boundary parameters is based on the first ground level under which the shield tunnel passes. The subway line tunnel and the high-speed rail line tunnel have been determined. During the actual shield tunneling construction at the target site, the first underground structure the shield tunnel will pass under is the right subway line, and the last underground structure it will pass under is the high-speed rail line tunnel. The maximum horizontal distance from the starting point of the shield tunnel passing under the right subway line to the ending point of the shield tunnel passing under the high-speed rail line tunnel is 70.7m. Therefore, the length of the boundary parameter must be at least greater than 172.2m. The burial depth of the shield tunnel at the target site is 35.1m, and the diameter of the shield tunnel is 14.5m. Therefore, the height of the shield tunnel must be at least greater than 78.6m.

[0094] In this embodiment, for convenience, the boundary parameters of the target plot are rounded, and the finally determined boundary parameters are 200 m in length, 150 m in width, and 100 m in height. A first model of the target plot is established based on the finally determined boundary parameters. The first model is provided with sliding constraints at the front, back, left and right, a fixed constraint at the bottom, and a free boundary at the top. The first model also shows an X axis, a Y axis and a Z axis, wherein the shield tunnel is excavated along the positive direction of the Y axis.

[0095] In step S202, second construction parameters and position parameters of the underground structures are determined based on the structure parameters.

[0096] In this embodiment, the underground structures of the target plot mainly include a first subway line tunnel and a high-speed rail line tunnel, and the first subway line tunnel includes a left subway line and a right subway line. According to the obtained structure parameters of each underground structure, the second construction parameters and position parameters of the left subway line, the right subway line and the high-speed rail line tunnel are obtained. The second construction parameters are used to simulate the tunnel shape and diameter of the underground structures in the first model, and the position parameters are used to make the positions of the underground structures in the first model consistent with the actual positions. Based on the second construction parameters and the position parameters, all the underground structures in the target plot can be accurately simulated in the first model.

[0097] In step S203, the underground structures are added to the first model according to the second construction parameters and the position parameters, and a numerical model of the target plot is obtained.

[0098] In this embodiment, all the existing underground structures in the target plot can be added to the first model according to the second construction parameters and the position parameters, thereby forming the numerical model of the target plot, as shown in Figure 4 . Figure 4 The numerical model of the target plot is a schematic diagram, which contains a new line shield tunnel, an existing first subway line tunnel and an existing high-speed rail line tunnel.

[0099] It should be noted that in the first model, the first subway line tunnel is excavated along the positive direction of the X axis, and the high-speed rail line tunnel is excavated along the positive direction of the X axis.

[0100] In addition, Figure 3 The different color blocks on the right represent different strata of the target plot, i.e. the material parameters of the target plot, from top to bottom: miscellaneous fill, clay (plastic), pebble (slightly dense), pebble (medium dense), medium sand (medium dense), pebble (medium dense), pebble (dense), mudstone (moderate weathering). The material parameters of the target plot also need to be put into the numerical model according to the actual situation to ensure the accuracy of the model. The material parameters of the target plot are obtained by combining field and indoor test data and referring to related research results of stratum parameters in adjacent areas. The main parameters of each stratum of the target plot can be referred to Table 1 below.

[0101] Table 1 main parameters of stratum where target plot is located

[0102]

[0103] In Table 1, E’ is the elastic modulus; v' is the Poisson's ratio; c’ ref is the effective cohesion; φ' is the effective internal friction angle; ψ is the soil dilatancy angle, which is empirically valued, and generally takes a value of 0.

[0104] The embodiment is based on the first construction parameter and the structural parameter, and establishes a numerical model for the target plot of the shield tunnel construction, prepares for the shield tunnel simulation construction on the numerical model, makes the existing underground structure in the numerical model closer to the real scene through the structural parameter, and ensures the accuracy of the simulation result.

[0105] As Figure 1 shown, the embodiment of the present application provides a method for detecting the curtain blocking effect of a shield tunnel underpassing an underground structure group, comprising the following steps:

[0106] Step S300, determining the constitutive model type according to the material parameters of the target plot, and simulating the construction process of the shield tunnel in the numerical model based on the first construction parameter and the constitutive model.

[0107] Specifically, in one implementation manner of the embodiment, step S300 comprises the following steps:

[0108] Step S301, acquiring the material parameters of the target plot.

[0109] In the embodiment, the material parameters of the target plot mainly include the material type of the stratum where the target plot is located and corresponding parameters, as shown in Table 1 main parameters of stratum where target plot is located.

[0110] Step S302, determining the constitutive model type used in the simulation construction process of the shield tunnel according to the material parameters.

[0111] In the embodiment, the selected three-dimensional geotechnical engineering finite element analysis software is Plaxis 3D, and the commonly used constitutive model types in the software include: Mohr-Coulomb model, Hardening Soil model, Hardening Soil with Small strain model and the like.

[0112] Among them, the M-C model is an ideal elastic-plastic model, which can well describe the material properties of soil and is easy to obtain parameters, so it is widely used in geotechnical engineering. The unified body of the embodiment mainly relates to two materials of rock-soil and concrete. In the simulation calculation, the soil layer is regarded as an elastic-plastic body, so the M-C model is used to simulate the mechanical behavior of the soil body. The model contains 9 parameters in total. According to the background engineering geological investigation report of the newly built line, the model stratum is generalized from top to bottom as follows: miscellaneous fill, clay (plastic), pebble (slightly dense), pebble (medium dense), medium sand (medium dense), pebble (medium dense), pebble (dense), mudstone (medium weathering), and the main stratum parameters of the target plot are obtained by combining the field and indoor test data and referring to the related research results of the stratum parameters of the adjacent area as shown in Table 1.

[0113] In addition, the simulation of the shield machine adopts isotropic linear elastic plate elements, and the elastic modulus is set to 200 GPa. The concrete lining is realized by using isotropic linear elastic solid elements, the concrete grade is C40, the weakening effect of joints on stiffness is considered, the effective stiffness ratio of the circumferential lining is set to 0.7, and the effective stiffness ratio of the longitudinal lining is set to 0.1. That is, the circumferential elastic modulus of the lining is 21.7 GPa, the longitudinal elastic modulus is 31 GPa, and the Poisson's ratio is 0.1. The interface element is used to simulate the interaction between the shield machine and the surrounding soil and the interaction between the lining and the surrounding soil. Considering the roughness of the sand layer and the lining interface, the strength of the interface element is set to 1.0. Other material parameters of the embodiment are shown in Table 2.

[0114] Table 2 Other material parameters

[0115]

[0116] In one implementation manner of the embodiment, before the construction process of the simulated shield tunnel is performed, the third construction parameter of the shield tunneling construction of the embodiment needs to be set.

[0117] Specifically, when Plaxis 3D simulates the construction process, the tunnel geometric model is divided into several construction sections along the tunnel axis direction, and the calculation process is composed of several "plastic" calculation stages, each of which is used to simulate the same excavation construction process. Shield tunneling will disturb the surrounding soil layer, causing deformation of the soil body. The simulated shield machine is selected as a soil pressure balanced shield machine, and the general process of normal shield tunneling is as follows: when the shield machine excavates forward, simultaneous grouting is performed at the shield tail, and after the complete excavation of a ring is completed, the pipe piece is assembled at the corresponding position, which is a complete one-step tunneling, and the shield gradually excavates until the whole tunnel construction is completed. The three-dimensional geotechnical engineering finite element analysis software Plaxis 3D simulates the construction process by gradually excavating, and needs to consider the grouting pressure, support force of the working face, jack thrust and other construction parameters during the construction process.

[0118] Due to the slight taper of the tunnel boring machine, the soil-structure interaction must be added outside the tunnel. In this embodiment, the shield tunnel excavation is 2m per construction section, the machine head of the super-large diameter shield machine is 12m long, and the cross-sectional area of the tail of the shield machine is about 0.1% smaller than that of the head. The reduction in diameter is achieved over a length of 10m in front of the shield machine. That is, the remaining 5 sections are linearly contracted, and the total contraction rate of the machine head of the shield machine is , the incremental contraction of the machine head of the shield machine , represents the incremental contraction of the machine head of the shield machine per meter, the negative sign only indicates the direction, and the shield tunneling process of the shield tunnel is as shown in Figure 5 , Figure 5 is a schematic diagram of the shield tunneling simulation of the newly built line.

[0119] During the tunneling process, the shield needs to push itself forward to separate from the completed lining. This process is achieved through hydraulic jacks, so a jacking force in the opposite direction of the support force of the working face is also provided on the rear side of the plane. The finally calculated construction parameter values of the shield tunneling construction are shown in Table 3.

[0120] Table 3 Construction parameter values of shield tunneling construction

[0121]

[0122] The negative sign in Table 3 only indicates the direction, represents the stress at the top of the section, represents the stress per meter increase with depth.

[0123] Step S303, balance the ground stress of the target plot and activate all underground structures in the target plot.

[0124] In this embodiment, before the shield tunnel construction process simulation is performed, the initial ground stress of the target plot needs to be balanced to make the numerical model in a "zero deformation" state before loading, and the numerical model can only reflect the additional deformation caused by the subsequent shield tunnel simulation construction. If the initial ground stress is not balanced, the model will produce unreasonable large deformation due to the absence of initial ground stress, which does not conform to the actual situation.

[0125] After the ground stress balance of the target plot is completed, the existing underground structures need to be activated, and the soil inside the first subway line tunnel and the high-speed rail line tunnel is frozen to activate the plate element.

[0126] Step S304, divide the simulation construction process of the shield tunnel into a preset number of construction sections, use the constitutive model to simulate the shield tunnel construction process of each construction section on the numerical model, and complete one construction simulation of all underground structures in the target plot.

[0127] In the embodiment, the simulation construction process of the shield tunnel is divided into a preset number of construction sections, the construction process of each construction section of the shield tunnel is simulated on the numerical model using the constitutive model and the third construction parameter, and the shield tunnel is excavated along the positive direction of the X axis, the left line of the shield tunnel is excavated first, and then the right line of the shield tunnel is excavated.

[0128] Specifically, referring to the earth pressure balance shield tunneling mode, the shield segment and the shield shell are simulated by using a plate element, the grouting is simulated by using a surface load, and the stratum loss in the shield excavation process is simulated by using surface shrinkage. In one cycle step, the shield face pressure is set to 600 kN / m 2 , is increased by 50 kN / m 2 per meter, the grouting pressure is also set to 800 kN / m 2 , is increased by 50 kN / m 2 per meter, the jack pressure is set to 1200 kN / m 2 , and the concrete grade is C40.

[0129] It should be noted that the model strain field and displacement field need to be reset to zero before the simulation of the excavation phase starts, and the calculation steps of the numerical model are 164 steps, wherein: steps 2 to steps 83 are for the left line of the shield tunnel to pass through; and steps 84 to steps 165 are for the right line of the shield tunnel to pass through.

[0130] As shown in Figure 6 , it is a simulation construction schematic diagram of the shield tunnel in the numerical model to pass through the first subway line tunnel and the high-speed rail line tunnel, based on Figure 6 , further obtained as shown in Figure 7 , it is a schematic diagram of the measuring line and the characteristic point of the shield tunnel simulation construction, taking the right line of the first subway line tunnel as the characteristic section, taking eight characteristic points, namely, A1, B1, C1, D1, E1, F1, G1, and H1, and taking the characteristic section of the high-speed rail line tunnel as six characteristic points, namely, A3, B3, C3, D3, E3, and F3.

[0131] Further, the six points A1, B1, A2, B2, A3, and B3 are extended to the negative direction of the X axis to obtain six measuring lines, namely, A1 measuring line, B1 measuring line, A2 measuring line, B2 measuring line, A3 measuring line, and B3 measuring line.

[0132] It should be noted that this step uses the constitutive model to simulate the construction process of each construction section of the shield tunnel on the numerical model, and after the construction process of all construction sections is completed, it is determined that the simulation of one construction of all underground structures in the target plot is completed, so as to be distinguished from the simulation of two constructions of a single underground structure in step S305.

[0133] In an implementation form of the embodiment, step S300 further comprises the following steps:

[0134] Step S305, sequentially select a single underground structure in the shield tunnel which has not been simulated for the secondary construction simulation to simulate the secondary construction simulation, until all the underground structures complete the secondary construction simulation.

[0135] In the embodiment, the secondary construction simulation of the underground structure is performed on a single underground structure, and the purpose is to simulate the influence of the shield tunnel construction on the single underground structure when there is only a single underground structure in the existing underground structure and there is no curtain blocking effect.

[0136] In an implementation form of the embodiment, the method of the secondary construction simulation comprises the following steps:

[0137] Step S305a, reload the numerical model which has not simulated the construction process of the shield tunnel.

[0138] In the embodiment, the simulation of the construction process of the shield tunnel in step S304 is recorded as a primary construction simulation, and the numerical model which has not simulated the construction process of the shield tunnel is reloaded, that is, the numerical model before step S304 primary construction simulation but after step S303 balancing the ground stress of the target plot and activating all the underground structures in the target plot is reloaded.

[0139] It should be noted that the numerical model which has not simulated the construction process of the shield tunnel can also be the numerical model before step S303, but the numerical model needs to be balanced for the ground stress of the target plot before step S305b can be performed.

[0140] Step S305b, close all the underground structures in the target plot and activate a single underground structure in the target plot again;

[0141] In the embodiment, all the underground structures in the target plot are closed, and a single underground structure which has not been simulated for the secondary construction simulation is activated again.

[0142] Step S305c, balance the ground stress of the target plot again, and simulate the shield tunnel construction process of each construction section on the numerical model using the constitutive model.

[0143] It should be noted that the secondary construction simulation also needs to reset the model strain field and displacement field to zero before simulating the excavation phase.

[0144] In the embodiment, the shield tunnel is a large-diameter shield tunnel, and the change of the cross section of the existing underground structure caused by the shield tunnel passing through the existing underground structure can be used to analyze the cross section shrinkage deformation law of the existing underground structure.

[0145] As shown in Figure 1 The embodiment of the present application provides a method for detecting the curtain blocking effect of a shield tunnel passing through a group of underground structures, which comprises the following steps:

[0146] In step S400, the cross-sectional images of each underground structure at a preset construction time are obtained, the ellipticity of the cross section in each cross-sectional image is calculated, and whether there is a curtain blocking effect between all the underground structures is determined according to the ellipticity.

[0147] Specifically, in one implementation of the embodiment, step S400 comprises the following steps:

[0148] In step S401, the cross-sectional images of each underground structure at a preset construction time are obtained.

[0149] In the embodiment, the shield tunnel is a large-diameter shield tunnel, and the change of the cross section of the existing underground structure caused by the shield tunnel passing through the existing underground structure can be used to analyze the cross section shrinkage deformation law of the existing underground structure.

[0150] It should be noted that the embodiment discussed is the curtain blocking effect between existing underground structures, and the high-speed rail tunnel is a single-track double-line tunnel and is far away from the subway tunnel, so the change of the cross section of the high-speed rail tunnel is not considered in the embodiment.

[0151] In the embodiment, the cross section of each underground structure at a preset construction time is obtained, that is, the cross section of the left-line subway tunnel and the right-line subway tunnel at a preset construction time is obtained and analyzed. In step S304, the characteristic cross section of the right-line tunnel of the first subway line has 8 characteristic points A1, B1, C1, D1, E1, F1, G1 and H1, the time corresponding to the 8 characteristic points is the preset construction time, and the final picture is the cross section of the right-line subway tunnel at the 8 preset construction times; the left-line subway tunnel characteristic cross section, characteristic point and cross section are obtained in the same way as the right-line subway tunnel.

[0152] In step S402, the cross-sectional relative deformation diagram is drawn based on the cross-sectional images and structure parameters of the underground structures.

[0153] In the embodiment, according to the structure parameters of the existing underground structure, the initial cross section is selected as the solid cross section of the cross section relative deformation diagram, and the cross sections at the 8 preset construction time points in step S401 are selected as the dotted cross sections of the cross section relative deformation diagram, and the cross section relative deformation diagram is drawn according to the solid cross section and the dotted cross section.

[0154] In the embodiment, the deformation amount of the cross section is the displacement result in the Y axis direction and the Z axis direction.

[0155] It should be noted that the deformation amount of the cross section after actual construction is small, and it is difficult to intuitively reflect the change relative to the initial cross section. In the embodiment, the deformation amount is enlarged by 1000 times to intuitively reflect the relative change of the cross section, and finally the cross section relative deformation diagram of the existing first subway line tunnel as shown in Figure 8 、 Figure 9 is obtained, wherein Figure 8 represents the cross section relative deformation diagram of the right line tunnel of the subway, Figure 9 represents the cross section relative deformation diagram of the left line tunnel of the subway.

[0156] Step S403: According to the cross section relative deformation diagram, the ellipticity of the cross section in each cross section image is calculated.

[0157] As shown in Figure 10 , it is an ellipticity calculation parameter identification schematic diagram. By drawing the cross section relative deformation diagram, the parameters of the cross section change can be obtained, such as the major axis b and the minor axis a. In the embodiment, the ellipticity is the ratio of the minor axis b to the major axis a of the ellipse. This value is used to represent the ductility and flatness of the ellipse. The flatter and longer the cross section shape is, the smaller the value is. The ellipticity calculation formula is as follows:

[0158] .

[0159] In one implementation manner of the embodiment, step S400 further includes the following steps:

[0160] Step S404: According to a preset rule, the first underground structure which needs to perform the existing curtain blocking effect judgment is selected from all the underground structures.

[0161] Step S405: The ellipticity of the cross section of the first underground structure at all preset construction time points in the primary construction simulation and the secondary construction simulation is obtained in sequence.

[0162] Step S406: If the ellipticity of the first underground structure at any construction time point in the primary construction simulation is greater than the ellipticity of the first underground structure at the same construction time point in the secondary construction simulation, it is determined that the first underground structure is an underground structure with the existing curtain blocking effect.

[0163] Step S407: Based on the structural parameters of the underground structure, a second underground structure corresponding to the first underground structure is obtained. If the second underground structure is an underground structure with a curtain barrier effect, it is determined that there is a curtain barrier effect between the first underground structure and the second underground structure.

[0164] In this embodiment, a second underground structure corresponding to the first underground structure is obtained based on the structural parameters of the underground structure. Specifically, an existing underground structure that is close to or parallel to the first underground structure is identified, that is, an existing underground structure that may have a curtain-like barrier effect with the first underground structure, and this is taken as the second underground structure.

[0165] Furthermore, based on the method for determining the curtain barrier effect between the first and second underground structures, it can be determined whether a curtain barrier effect exists between all underground structures.

[0166] In addition to calculating the rate of change of the cross-section, by extracting the major and minor axes of the cross-section at each preset construction time of the first subway line tunnel, the change in ellipticity following the tunnel excavation process can be calculated. Based on this, the following diagram can be drawn: Figure 11 The diagram shows the curve of the cross-sectional ellipticity variation of the tunnel of the first subway line.

[0167] like Figure 11 As shown, the ellipticity of both the left and right subway tunnels decreased. Specifically, the ellipticity decreased significantly between T1 and T2. The ellipticity of the right tunnel stabilized between T2 and T5, while the ellipticity of the left tunnel continued to decrease slightly between T2 and T3, stabilizing between T3 and T5. The ellipticity of the cross-section of both subway tunnels decreased rapidly between T5 and T7. The ellipticity of the right tunnel showed no significant change between T7 and T10. The ellipticity of the left tunnel continued to decrease between T7 and T8, stabilizing between T8 and T10. The lowest ellipticity reached 0.63 for the left tunnel and 0.60 for the right tunnel. It can be seen that the ellipticity decreased rapidly when the shield tunnel approached and crossed the first subway line between T1 and T2 and between T5 and T7, while it remained almost unchanged when moving away from the first subway line.

[0168] To further verify the curtain blocking effect, the secondary construction simulation method described in step S305 was used to conduct secondary construction simulations for the left and right subway tunnels, respectively. The calculated ellipticity variation curves are shown below. Figure 11 As shown by the blue dashed line.

[0169] Figure 11The middle blue dotted line shows that the ellipticity of the left and right metro tunnels is greatly reduced from 0.86 to 0.76, which is 0.02 lower than the ellipticity of the right metro tunnel when the double-line tunnel exists. The ellipticity remains stable during T2-T5, and decreases from 0.76 to 0.58 during T5-T7, and does not change significantly during T7-T10. Overall, the calculation result curve of the left and right metro tunnels is always below the curve when the double-line tunnel exists, and the cross-sectional ellipticity of the left and right metro tunnels reaches 0.57, which is the lowest, while the lowest ellipticity when the double-line tunnel exists is 0.60.

[0170] It can be concluded that the existence of the double-line tunnel increases the ellipticity of the cross section of the metro tunnel, with an increase of 0.03 for the right metro tunnel and an increase of 0.06 for the left metro tunnel, indicating that the interaction between the tunnel groups reduces the influence of the newly built line shield tunnel underpass, i.e. there is a curtain blocking effect, specifically between the left and right metro tunnels.

[0171] From the above, it can be concluded that there is a curtain blocking effect between the left and right metro tunnels, and from the figure it can also be seen that the ellipticity of the right metro tunnel is always lower than that of the left metro tunnel, which can be concluded that the right metro tunnel will have a certain control effect on the cross-sectional ellipticity of the left metro tunnel when it is first crossed.

[0172] As shown in Figure 1 , the embodiment of the present application provides a method for detecting the curtain blocking effect of a shield tunnel underpassing an underground structure group, comprising the following steps:

[0173] Step S500, according to the ellipticity, calculating and outputting the curtain blocking effect coefficient between the underground structures with the curtain blocking effect.

[0174] Specifically, in one implementation manner of the embodiment, step S500 comprises the following steps:

[0175] Step S501, selecting a third underground structure, and the third underground structure and a fourth underground structure have a curtain blocking effect therebetween;

[0176] In the embodiment, the third underground structure and the fourth underground structure are only used for naming distinction with the first underground structure and the second underground structure in the foregoing text. When there is a curtain blocking effect between the first underground structure and the second underground structure, the third underground structure can be any one of the first underground structure and the second underground structure, and the fourth underground structure is the other one at this time. Alternatively, it can be considered that the third underground structure and the fourth underground structure and the first underground structure and the second underground structure are used for naming distinction in a state of judging whether there is a curtain blocking effect of the existing underground structure. When there is a curtain blocking effect, the third underground structure and the fourth underground structure are used for naming the underground structure with the curtain blocking effect.

[0177] In step S502, a first ellipticity is obtained. The first ellipticity is defined as an average value of the minimum values of the ellipticity of the third underground structure and the fourth underground structure at the preset construction time after all the underground structures in the target plot are activated.

[0178] In the embodiment, the first ellipticity is defined as an average value of the minimum values of the ellipticity of the third underground structure and the fourth underground structure with the curtain blocking effect at the preset construction time after one construction simulation of the numerical model is performed.

[0179] In the embodiment, the first ellipticity is an average value of the minimum values of the ellipticity of the left-line subway tunnel and the right-line subway tunnel, that is, Figure 11 In the embodiment, the first ellipticity is an average value of the minimum values of the ellipticity of the left-line subway tunnel and the right-line subway tunnel, that is,

[0180] In step S503, a second ellipticity is obtained. The second ellipticity is defined as a minimum value of the ellipticity of the third underground structure at the preset construction time when only the third underground structure in the target plot is activated.

[0181] In the embodiment, the second ellipticity is defined as a minimum value of the ellipticity of the third underground structure or the fourth underground structure at all the preset construction times after two construction simulations of the numerical model are performed.

[0182] In the embodiment, the second ellipticity is a minimum value of the ellipticity of the left-line subway tunnel or the right-line subway tunnel, that is, Figure 11 In the embodiment, the second ellipticity is a minimum value of the ellipticity of the left-line subway tunnel or the right-line subway tunnel, that is,

[0183] In step S504, a curtain blocking effect coefficient is calculated and output according to the first ellipticity and the second ellipticity.

[0184] ;

[0185] wherein, is a shade barrier effect coefficient, is a first ellipticity, is a second ellipticity.

[0186] In the embodiment, the shade barrier effect coefficient means: a parameter for evaluating the degree of the shade barrier effect for improving the ellipticity of the existing underground structure.

[0187] In the embodiment, the shade barrier effect coefficient Figure 11 between the left-line subway tunnel and the right-line subway tunnel is calculated according to the data in is 7.89%.

[0188] In the embodiment, by obtaining the cross section of each underground structure at a preset construction time, drawing a cross section relative deformation diagram and calculating the ellipticity of each cross section, it can be judged whether there is a shade barrier effect between the existing underground structures according to the change of the ellipticity, and the shade barrier effect coefficient quantifies the shade barrier effect, so that the quantified shade barrier effect between the existing underground structures is more intuitive, and also provides theoretical and data support for improving the construction of the new line shield tunnel based on the shade barrier effect.

[0189] The above technical solution achieves the following technical effects:

[0190] The embodiment establishes a numerical model of the target plot based on the first construction parameter of the shield tunnel, obtains the cross section of the existing underground structure group at a preset construction time by simulating the construction process of the shield tunnel, and then can realize the judgment of whether there is a shade barrier effect between the existing underground structures, and gives a calculation method for calculating the shade barrier effect between multiple existing tunnels through the ellipticity, which can provide a reference for the actual construction and facilitate the reasonable planning of the super-large diameter shield tunnel construction scheme of the target plot; when the shield tunnel underpasses the existing underground structure group, the shade barrier effect can also be used to quantify the shade barrier effect through the shade barrier effect coefficient, so as to minimize the influence of the shield tunnel construction on the existing underground structure group, thereby achieving sufficient protection of the existing underground structure group.

[0191] Exemplary apparatus

[0192] Based on the above embodiment, the present application also provides a shade barrier effect detection system for a shield tunnel underpassing an underground structure group, comprising:

[0193] A parameter acquisition module acquires the first construction parameter of the shield tunnel and the structure parameter of the underground structure.

[0194] a model establishing module, configured to construct a numerical model of a target plot based on the first construction parameter and the structure parameter, wherein the target plot is a target plot of shield tunnel construction;

[0195] a construction simulation module, configured to determine a constitutive model type according to a material parameter of the target plot, and simulate a construction process of the shield tunnel in the numerical model based on the first construction parameter and the constitutive model;

[0196] a blind barrier effect judgment module, configured to obtain a cross-sectional image of each of the underground structures at a preset construction time, calculate an ellipticity of a cross section in each of the cross-sectional images, and determine whether a blind barrier effect exists between all the underground structures according to the ellipticity;

[0197] a blind barrier effect calculation module, configured to calculate and output a blind barrier effect coefficient between underground structures with the blind barrier effect according to the ellipticity.

[0198] The technical solution achieves the following technical effects:

[0199] The self-encoder is used to extract features with time invariance from single modal different time images, reduce time sequence change interference, and enhance cross time feature consistency. In addition, the geographic index information is used to construct a contrast learning task, enhance spatial invariant feature representation, and improve cross-modal feature alignment accuracy. The bottleneck attention is introduced to dynamically evaluate the importance of each modal, adjust the fusion weight, strengthen the contribution of key modal, and improve the robustness of feature fusion. The embodiment fully considers the spatiotemporal invariant features and importance of each modal, realizes adaptive multi-modal remote sensing image feature-level fusion, and improves the fusion accuracy of multi-modal remote sensing image features.

[0200] Based on the above embodiment, the application further provides a terminal, and a principle block diagram thereof can be as shown in Figure 12 .

[0201] The terminal includes a processor, a memory, an interface, a display screen, and a communication module connected through a system bus. The processor of the terminal is configured to provide computing and control capabilities. The memory of the terminal includes a computer readable storage medium and an internal memory. The computer readable storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program in the computer readable storage medium to run. The interface is configured to connect external devices. The display screen is configured to display corresponding information. The communication module is configured to communicate with a cloud server or other devices.

[0202] The computer program is used to realize the operation of the shield tunnel underpassing underground structure group curtain shielding effect detection method when executed by the processor.

[0203] In an embodiment, a terminal is provided, comprising: a processor and a memory, the memory storing a shield tunnel underpassing underground structure group curtain shielding effect detection program, the shield tunnel underpassing underground structure group curtain shielding effect detection program being used to realize the operation of the shield tunnel underpassing underground structure group curtain shielding effect detection method when executed by the processor.

[0204] In an embodiment, a computer readable storage medium is provided, wherein the computer readable storage medium stores a shield tunnel underpassing underground structure group curtain shielding effect detection program, the shield tunnel underpassing underground structure group curtain shielding effect detection program being used to realize the operation of the shield tunnel underpassing underground structure group curtain shielding effect detection method when executed by the processor.

[0205] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing related hardware, and the computer program can be stored in a non-volatile storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. Any reference to memory, storage, database or other medium used in the embodiments of the present application can include non-volatile and volatile memory.

[0206] In summary, the present application provides a shield tunnel underpassing underground structure group curtain shielding effect detection method, system, terminal and storage medium, comprising: obtaining first construction parameters of a shield tunnel and structure parameters of underground structures; based on the first construction parameters and the structure parameters, constructing a numerical model of a target plot; wherein the target plot is a target plot of shield tunnel construction; determining a constitutive model type according to the material parameters of the target plot, simulating the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model; obtaining a cross-sectional image of each underground structure at a preset construction time, calculating the ellipticity of the cross section in each cross-sectional image, and determining whether there is a curtain shielding effect between all the underground structures according to the ellipticity; according to the ellipticity, calculating and outputting the curtain shielding effect coefficient between the underground structures with curtain shielding effect; the present application can realize the judgment of whether the curtain shielding effect exists between the existing underground structures, and can quantify the curtain shielding effect through the curtain shielding effect coefficient.

[0207] It is to be understood that the application is not limited to the examples described above, which can be modified or adapted in several ways by those skilled in the art without departing from the scope of the present application, as defined by the appended claims.

Claims

1. A method for detecting the curtain barrier effect when a shield tunnel passes under an underground structure group, characterized in that, The underground structure group includes at least two underground structures, and the method for detecting the curtain barrier effect of the shield tunnel passing under the underground structure group includes: Obtain the first construction parameters of the shield tunnel and the structural parameters of the underground structure; Based on the first construction parameters and the structural parameters, a numerical model of the target site is constructed; wherein, the target site is the target site for shield tunnel construction; The constitutive model type is determined based on the material parameters of the target site, and the construction process of the shield tunnel is simulated in the numerical model based on the first construction parameters and the constitutive model. Obtain cross-sectional images of each underground structure at a preset construction time, calculate the ellipticity of the cross section in each cross-sectional image, and determine whether there is a curtain-like obstruction effect between all the underground structures based on the ellipticity. Based on the ellipticity, calculate and output the curtain barrier effect coefficient between underground structures that have a curtain barrier effect. The step of acquiring cross-sectional images of each underground structure at a preset construction time and calculating the ellipticity of the cross-section in each cross-sectional image includes: Obtain cross-sectional images of each of the underground structures at a preset construction time; Based on the cross-sectional images and structural parameters of the underground structure, a diagram of relative deformation of the cross-section is drawn. Based on the cross-sectional relative deformation diagram, calculate the ellipticity of the cross-section in each cross-sectional image; The step of determining whether a curtain-like barrier effect exists between all the underground structures based on the ellipticity includes: Select the first underground structure from all the underground structures according to the preset rules; The ellipticity of the cross section of the first underground structure at all preset construction times in the first and second construction simulations is obtained sequentially. If the ellipticity of the first underground structure at any construction time in a single construction simulation is greater than the ellipticity of the first underground structure at the same construction time in a second construction simulation, then the first underground structure is considered to be an underground structure with a curtain-like barrier effect. Based on the structural parameters of the underground structure, a second underground structure corresponding to the first underground structure is obtained. If the second underground structure is an underground structure with a curtain barrier effect, then it is determined that there is a curtain barrier effect between the first underground structure and the second underground structure.

2. The method for detecting the curtain barrier effect of a shield tunnel passing under an underground structure group according to claim 1, characterized in that, The step of constructing a numerical model of the target site based on the first construction parameters and the structural parameters includes: Based on the first construction parameters, the boundary parameters of the target plot are determined, and a first model of the target plot is established based on the boundary parameters. Based on the structural parameters, determine the second construction parameters and location parameters of the underground structure; The underground structure is added to the first model based on the second construction parameters and the location parameters to obtain the numerical model of the target plot.

3. The method for detecting the curtain barrier effect of a shield tunnel passing under an underground structure group according to claim 1, characterized in that, The step of determining the constitutive model type based on the material parameters of the target site, and simulating the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model, includes: Obtain the material parameters of the target plot; The constitutive model type used in the simulation construction process of the shield tunnel is determined based on the material parameters. The ground stress of the target plot is balanced, and all the underground structures in the target plot are activated; The simulated construction process of the shield tunnel is divided into a preset number of construction segments. The constitutive model is used to simulate the shield tunnel construction process of each construction segment on the numerical model, thereby completing a construction simulation of all underground structures in the target plot.

4. The method for detecting the curtain-like barrier effect of a shield tunnel passing under an underground structure group according to claim 3, characterized in that, The step of determining the constitutive model type based on the material parameters of the target site and simulating the construction process of the shield tunnel based on the first construction parameters and the constitutive model further includes: sequentially selecting individual underground structures in the shield tunnel that have not undergone secondary construction simulation for secondary construction simulation, until all underground structures have completed secondary construction simulation; The method for secondary construction simulation includes: Reload the numerical model that does not simulate the construction process of the shield tunnel; Close all underground structures in the target plot, and then reactivate a single underground structure in the target plot; The ground stress of the target plot is rebalanced, and the constitutive model is used to simulate the shield tunnel construction process of each construction segment on the numerical model.

5. The method for detecting the curtain barrier effect of a shield tunnel passing under an underground structure group according to claim 1, characterized in that, The step of calculating and outputting the curtain-blocking effect coefficient between underground structures exhibiting a curtain-blocking effect based on the ellipticity includes: A third underground structure is selected, and there is a curtain-like barrier effect between the third underground structure and the fourth underground structure. Obtain a first ellipticity, which is defined as the average of the minimum ellipticities of the third underground structure and the fourth underground structure at a preset construction time when all the underground structures in the target plot are activated. Obtain the second ellipticity, which is defined as the minimum ellipticity of the third underground structure at a preset construction time when only the third underground structure is activated in the target plot. The curtain blocking effect coefficient is calculated and output based on the first ellipticity and the second ellipticity: ； in, This is the curtain blocking effect coefficient. The first ellipticity, This is the second ellipticity.

6. A system for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group, used to implement the method for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group as described in any one of claims 1-5, characterized in that, include: The parameter acquisition module acquires the first construction parameters of the shield tunnel and the structural parameters of the underground structure. The model building module is used to construct a numerical model of the target site based on the first construction parameters and the structural parameters; wherein, the target site is the target site for shield tunnel construction; The construction simulation module is used to determine the constitutive model type based on the material parameters of the target site, and to simulate the construction process of the shield tunnel in the numerical model based on the first construction parameters and the constitutive model. The curtain barrier effect judgment module is used to acquire cross-sectional images of each underground structure at a preset construction time, calculate the ellipticity of the cross section in each cross-sectional image, and determine whether there is a curtain barrier effect between all the underground structures based on the ellipticity. The curtain barrier effect calculation module is used to calculate and output the curtain barrier effect coefficient between underground structures that have a curtain barrier effect based on the ellipticity.

7. A terminal, characterized in that, include: The processor and memory, wherein the memory stores a program for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group, and the program for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group is executed by the processor to implement the operation of the method for detecting the curtain obstruction effect of a shield tunnel passing under an underground structure group as described in any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a curtain obstruction effect detection program for shield tunnels passing under underground structure groups. When the processor executes the curtain obstruction effect detection program for shield tunnels passing under underground structure groups, it is used to implement the operation of the curtain obstruction effect detection method for shield tunnels passing under underground structure groups as described in any one of claims 1-5.

Images